Hullo Sturm
Glad they were of use. The Commando wings are for part time volunteer aircrew who flew their own aircraft on military duties within their local area of responsibility. Commando in this context is from the original Boer war Commandos implying a part time volunteer as opposed to the British use of the word nowadays.
RO is Radio Operator as you correctly said. In Afrikaans M stands for Marconis (a little used name for a radio man).
FE is for Flight Engineer and the Afrikaans BT is for Boord Tegnikus (literally translated as on board technician).
SAAF rubberised badges were introduced in the 1980s. I do not have an exact date but believe that it was around 1983-4.
Hope this helps a bit.
Regards
Dudley
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